package com.huang.entity.dto;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;

public class CreateImageCode {
    //图片宽度
    private int width = 160;
    //图片高度
    private int height = 30;
    //验证码字符个数
    private int codeCount = 4;
    //验证码干扰线数
    private int lineCount = 20;
    //验证码
    private String code = null;
    //验证码图片Buffer
    private BufferedImage buffImage = null;
    Random random = new Random();

    public CreateImageCode() {
        creatImage();
    }

    public CreateImageCode(int width, int height, int codeCount, int lineCount) {
        this.width = width;
        this.height = height;
        this.codeCount = codeCount;
        this.lineCount = lineCount;
        creatImage();
    }

    public CreateImageCode(int width, int height, int codeCount) {
        this.width = width;
        this.height = height;
        this.codeCount = codeCount;
        creatImage();
    }

    public CreateImageCode(int width, int height) {
        this.width = width;
        this.height = height;
        creatImage();
    }

    //生成图片
    private void creatImage() {
        int fontWidth = width / codeCount; //字体宽度
        int fontHeight = height - 5; //字体高度
        int codeY = height - 8;
        //图像Buffer
        buffImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics g = buffImage.getGraphics();
        //设置背景色
        g.setColor(getRandColor(200, 250));
        g.fillRect(0, 0, width, height);
        //设置字体
        Font font = new Font("Fixedsys", Font.BOLD, fontHeight);
        g.setFont(font);
        //设置干扰线
        for (int i = 0; i < lineCount; i++) {
            int xs = random.nextInt(width);
            int ys = random.nextInt(height);
            int xe = xs + random.nextInt(width);
            int ye = ys + random.nextInt(height);
            g.setColor(getRandColor(1, 255));
            g.drawLine(xs, ys, xe, ye);
        }
        //添加噪点
        float yawpRate = 0.01f; //噪声率
        int area = (int) (yawpRate * width * height);
        for (int i = 0; i < area; i++) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            buffImage.setRGB(x, y, random.nextInt(255));
        }

        String strl = randomStr(codeCount); // 得到随机字符
        this.code = strl;
        for (int i = 0; i < codeCount; i++) {
            String strRand = strl.substring(i, i + 1);
            g.setColor(getRandColor(1, 255));
            g.drawString(strRand, i * fontWidth + 3, codeY);
        }
    }

    //得到随机字符
    private String randomStr(int n ){
        String str1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";
        StringBuilder str2 = new StringBuilder();
        int len = str1.length() - 1;
        double r ;
        for (int i = 0; i < n; i++) {
            r = (Math.random()) *len;
            str2.append(str1.charAt((int) r));
        }
        return str2.toString();
    }
    //得到随即色
    private Color getRandColor(int fc,int bc) {
        //给定范围获得随即色
        if (fc > 255) fc  = 255;
        if (bc > 255) bc  = 255;
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r,g,b);
    }
    //产生随机字体
    private Font getFont(int size) {
        Random random = new Random();
        Font[] font = new Font[5];
        font[0] = new Font("Ravie",Font.PLAIN,size);
        font[1] = new Font("Antique Olive Compact",Font.PLAIN,size);
        font[2] = new Font("Fixedsys",Font.PLAIN,size);
        font[3] = new Font("Wide Latin",Font.PLAIN,size);
        font[4] = new Font("Gill Sans Ultra Bold",Font.PLAIN,size);
        return font[random.nextInt(5)];
    }
    //扭曲方法
    private void shear(Graphics g , int w1 , int h1, Color color){
        shearX(g,w1,h1,color);
        shearY(g,w1,h1,color);
    }
    private void shearX(Graphics g, int w1, int h1, Color color) {

        int period = random.nextInt(2);

        int frames = 1;
        int phase = random.nextInt(2);

        for (int i = 0; i < h1; i++) {
            double d = (double) (period << 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
            g.copyArea(0, i, w1, 1, (int) d, 0);
            g.setColor(color);
            g.drawLine((int) d, i, 0, i);
            g.drawLine((int) d + w1, i, w1, i);
        }

    }

    private void shearY(Graphics g, int w1, int h1, Color color) {

        int period = random.nextInt(40) + 10; // 50;

        int frames = 20;
        int phase = 7;
        for (int i = 0; i < w1; i++) {
            double d = (double) (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
            g.copyArea(i, 0, 1, h1, 0, (int) d);
            g.setColor(color);
            g.drawLine(i, (int) d, i, 0);
            g.drawLine(i, (int) d + h1, i, h1);

        }

    }

    public void write(OutputStream sos) throws IOException {
        ImageIO.write(buffImage, "png", sos);
        sos.close();
    }

    public BufferedImage getBuffImg() {
        return buffImage;
    }

    public String getCode() {
        return code.toLowerCase();
    }
}

